Roll grinding machine



Dec-8,1936. e; G. FLYGAR'E Em. j 2,063,668

ROLL GRINDING MACHINE Filed DeC. 31, 1934 3 Sheets-Sheet 1 FTQ] 4IMQ/VWA CAR/ G. FLYG/lm: HUGO B. FR/BERG @Hm @W 8,v 1936. c. G. FLYGAREET AL,v

ROLL GRINDING MACHINE Filed Deo. 31, 19s4 :s shee-sheet 2 ma 0*/1 m7 2.

CARL GPU/GARE HUGO B. [TR-:BERG w @Mm H. my

Mhwmn.

Dec-18 1936 C. G. FLYGARE r-:r AL. 2,063,668

- ROLL GRINDING MACHINE i Filed Deo. 51, 1934 5 sheets-sheet s SOLENOIDe HIGH PRESSURE LOW PRESSURE EXHAUST L INE TO T SUCTION LINE TO TANK wwwn. I cmd wm CARL G. F/ YGARE m "QM- Hm Patented Dec. 8, 1936 UNITEDSTATES PATENT OFFICE Application December 31, 1934, Serial No. 759,948

16 Claims.

This invention relates to grinding machines for grinding large rolls,such as used in r'olling mills, and more particularly to a forming orcrowning attachment for producing a predetermined crown in the surfaceof the roll.

In rolling mill operations, it is necessary that the periphery of therolls between which the metal is rolled be provided with a surfacehaving the proper crown as well as a mirror finish, since anyirregularities or imperfections in the surface of the roll arereproduced in the product rolled by the mill. It is, therefore,essential that the periphery of the roll be ground to a mirror surfaceof desired quality, as well as to be ground f' with a predeterminedcrown on its periphery so that when the two opposed rolls are mounted inthe rolling mill, they will produce a product rolled therebetween whichmeets the required speciiications.

Heretofore, numerous forming or crowning attachments have been developedand utilized in the grinding of rolls to produce the desired curvatureon the surface of the rolls. Various types of mechanisms have beenutilized including flexible forming bars, rigid forming bars, and alsoadjustable supports for the roll being formed which enable the axis ofthe roll to be skewed relative to the axis of the wheel.

It has been found through years of experience and numerous tests whichhave been conducted with the various roll forming attachments which arenow utilized, that there is a bending or flexing of the swivel tablesupporting the roll during grinding, due to the pressure exerted by theforming apparatus and the pressure of the grinding wheel. It has beenproposed to overcome such difficulties by means of the constructionshown in the U. S. patent to H. W. Dunbar and Carl G. Flygare, No.1,970,000, dated August 14, 1934. This roll forming attachment dependedupon a fluid pressure system. in which fluid under pressure was forcedinto cylinders on opposite ends of the table to cause a swivelingmovement of the table as it reciprocated. This invention 45 relates toan improvement in that construction, in

that it provides a positively actuated control device which regulatesthe rotative crowning movements of the wheel and the work and thusinsures that the work is ground to a predetermined shape.

It is the primary object of this invention to provide a roll crowningapparatus for a grinding machine in which a hydraulically actuated,mechanically permitted swivelling movement is employed to produce acrown of the desired curvature.

It is another object of this invention to provide a suitable fluidpressure operated mechanism for causing a relative swiveling movementbetween the work supporting table and the longitudinally movable tableand to provide a positive control mechanism for regulating the movementof the swivel table as caused by the fluid pressure system.

It is a further object of this invention to provide a pressurecontrolling device which serves to permit regulation of the fluidpressure within the system so that the table may be initially flexed orbowed before the grinding operation has been started.

In a massive roll grinding machine of the type to which the presentinvention relates, the headstock is a massive, heavy unit which isusually many times as heavy as the footstock. This differential ofweight at opposite ends of the swivel table serves to cause adifferential friction between the opposite ends of the swivel table andthe longitudinally movable table which must be overcome by the formingattachment, `in order that the curvature or crown at each end of theroll may be properly shaped. Hence, it is desirable to provide asuitable pressure control means so that the pressure applied to thecylinder at either end of the table may be varied as desired.

It is a further object of the present invention to provide a pressurecontrol for the fluid pressure system which enables applying a variablepressure at either end of the swivel table, if desired, so that thevariation in pressure serves to compensate for the varying frictionbetween the parts and to prevent bowing of the table from its normallyadjusted position.

One embodiment of this invention has been illustrated in the drawings,in which like reference numerals indicate like parts:

Fig. 1 is a front elevation of a grinding machine embodying thisinvention;

Fig. 2 is a combined fragmentary plan view and diagrammatic View to showthe piping and electrical circuit of the machine;

Fig. 3 is a fragmentary cross-sectional view, on an enlarged scale, ofthe limit switch shown in Fig. 2;

Fig. 4 is a fragmentary longitudinal section, approximately on the line4-4 of Fig. 3, showing the limit switch for reversing the direction ofiiow of electrical energy in the system;

Fig. 5 is a fragmentary plan view, on an enlarged scale, of theoperating parts of the crowning control mechanism at the left-hand endof the swivel and longitudinal table;

Fig. 6 is a fragmentary cross-sectional view, taken approximately on theline 6 6 of Fig. 5;

Fig. 1 is a cross-sectional view, taken approximately on the line 1-1,showing the details of the crown control mechanism; and

Fig. 8 is a diagrammatic showing of a modied hydraulic system having apressure control valve which permits a variation in the iiuid pressurepassing to cylinders at opposite ends of the table.

This invention comprises broadly a roll grinding machine, in which theroll to be ground is rotatably supported on a swivel table. The swiveltable is povotally mounted on a longitudinally movable work table whichis arranged to be reciprocated longitudinally so as to carry the roll tobe ground past the periphery of the grinding wheel. A fluid pressuremechanism is interposed at opposite ends of the table between thelongitudinally movable table and the swivel table to swing the swiveltable relative to the longitudinally movable table as it reciprocates. Apositively actuated mechanical control device is provided to regulateand control the swiveling as caused by the hydraulic mechanism so as toproduce a desired crown on the periphery of the roll being ground.

As illustrated in the drawings, one embodiment of this invention hasbeen shown as adapted for a large, massive roll grinding machinecomprising a base I0 having a longitudinally movable work table IIreciprocably mounted on a flat way I2 and V-way I3 on the base I0. Agrinding wheel I4 is rotatably mounted on a wheel slide (not shown)which is arranged for a transverse feeding movement relative to thetable II by means of a manually or power operated wheel feedingmechanism I5. Details of the wheel feeding mechanism have not beenillustrated, since they do not constitute a part of this invention. Fordetails of construction as to the mounting of the grinding wheel and theconstruction of the wheel feeding mechanism, reference may be had to theprior U. S. patent to Norton No. '162,838 dated June 14, 1904. A swiveltable I6 is pivotally connected to the longitudinally movable table IIby a pivot pin I1 and is arranged so that the swivel table I6 may swivelabout the pivot pin I1 as the longitudinal table reciprocates so as tocause a relative transverse movement between the grinding wheel and thework and produce a desired crown upon the periphery of the work beingground. The swivel table I6 carries a rotatable work support including aheadstock I8 and a footstock I9 which serve to rotatably support a workpiece 2U on centers 2I and 22 respectively.

The longitudinally movable table I I may be reciprocated longitudinallyrelative to the base by means of a manually operable hand wheel 25 ormay be moved by a power actuated mechanism in which the table isautomatically reversed by adjustable dogs 26 and 21 and a reversecontrol lever 28. For details of the manual traverse or power actuatedreciprocating mechanism, reference may be had to the prior Norton PatentNo. 162,838 above referred to.

Hydraulic crowning mechanism In order that the swivel table I6 may beswivelled transversely in a horizontal plane relative to thelongitudinal table II when the table reciprocates, a hydraulic mechanismis provided to ,cause the desired transverse movement between the tablesso as to produce a desired predetermined curvature or crown on theperiphery of the roll 20 being ground. The hydraulic mechanism ispreferably a self-contained mechanism which is mounted on thereciprocable table II and consists of an electric motor 3D connected toa fluid pump 3|. The pump 3| draws fluid through an intake pipe 32 froma reservoir (not shown) and delivers uid through a pressure control orrelief valve 33 through a pipe 34 and a reverse valve 35. The reversevalve 35 is arranged to convey iiuid to opposite sides of a piston 36which is slidably mounted in a cylinder 31. The cylinder 31 is xedlymounted on the table II, and the piston 36 is connected by a link 38 toan extending bracket 39 formed as an integral part of the swivel tablei6. It will thus be seen that admission of uid under pressure to eitherside of the piston 35 will cause a swiveling movement between thelongitudinally movable table I I and the swivel table IB.

In the preferred construction, a double fluid pressure actuating meansis provided, such as illustrated in Fig. 2 of the drawings. Such amechanism includes a fluid pressure piston and cylinder at theright-hand end of the table, which is identical in every respect to thepiston and cylinder at the left-hand end. This mechanism comprises acylinder 40 fixed to the table I I and a piston 4I slidably mountedtherein and connected by a link 42 with a projecting bracket 43 of theswivel table I6.

The reversing valve 35 is operatively connected with the cylinders 31and 40 by means of pipes l5 and 43. The pipe 45 connects with the lowerchamber d8 of cylinder 31 and the upper chamber t9 of cylinder lill, as'viewed in Fig. 2. The pipe s6 is connected with the upper chamber 50 incylinder 31 and the lower chamber 5I in cylinder 4G, so that whenpressure is applied to either the pipe 45 or 36, the iiuid underpressure serves to cause a swiveling movement of the table I6 relativeto the reciprocable table II either in a clockwise, or counterclockwisedirection, as Viewed in Fig. 2. In the position of the reversing valve35, as illustrated in Fig. 2, fluid under pressure is being admittedthrough pipe 45 to cylinder chambers 138 and 49, so as to cause theswivel table Ill to move in a clockwise direction. The fluid pressureremains in this direction until the reverse valve 35 is shifted.

lt is desirable to provide a suitable interconnection between thereciprocable table and the fluid pressure system so that when the tableis moved in a direction toward the right (Fig. 2), the table I4 is movedin a clockwise direction. When the reversing mechanism is shifted tochange the direction of movement of table II, the fluid pressurereversing valve 35 is shifted to reverse the swiveling movement of tableI4 so that during movement of table I I towards the left (Fig. 2) theswivel table I6 is moved in a counterclockwise direction. This ispreferably accomplished by an electrically controlled mechanism which,in the preferred construction, is interconnected with the tablereversing mechanism so that when the adjustable dogs 2E and 21 actuatethe reversing lever 23 to change the direction of movement of the tableI I, this moveient also serves to operate reverse valve 35 and therebychange the direction of iiow of fluid pressure within the hydraulicsystem. To accomplish this result, a solenoid 52 is mounted on the tableIl and is connected to operate the revers- `ing valve 35 in onedirection, namely, downwardly.. as shown inFi'g. 2. A spring 53 servesto return the valve into the position illustratedv in Fig. 2. Areversing switch 54 is connected by a link 55 with the reversing lever28- so that when the switch is inl the positionv as illustrated in Fig.2, the circuit is open and the solenoid 52 is deenergized. When thereverse lever is shifted into the reverse position at the end of a tablestroke, the reversing switch shifts intothe position illustrated in thedotted line (Fig. 2), thereby energizing solenoid 52 and shifting thereversing valve 35 into a downward position` (Fig. 2) so as to admitfluid under pressure through the pipe 4.6 into cylinder chambers U and5I to cause the table to move in a counterclockwise direction. It willthus be seen that when the table II travels in one direction, the iiuidpressure piston and cylindex' serve. to swivel the table in onedirection andi when moved in the opposite direction serve to swivel thetable in the reverse direction.

Mechanically controlled swiveling movement In order that the swivelingmovement of the table I4 relative to the reciprocable table Ill may beaccurately controlled, it is desirable to provide a positively actuatedpermitting or controlling mechanism which serves to restrict themovement of the table by the fluid pressure mechanism, so that insteadof having a directly acting fluid pressure movement, a hydraulicallyactuated, mechanically permitted or controlled movement is provided. Itis desirable to provide a suitable control mechanism which is actuatedas the table reciprocates to positively control the swiveling movementof the swivel table I4 so as to produce a predetermined crown on theroll to be ground. In the preferred construction, a forming bar 60 ispivotally mounted on a stud 6I on the base I0 and is arranged to beadjusted angularly relative to the base, so that it may be positionedparallel with the movement of the reciprocatory table II to grind astraight cylindrical roll, or it may be adjusted angularly relative tothe table movement if it is desired to produce a crown on the peripheryof the roll being ground. A slide 62 is carried by the bar 66 and isoperatively connected by means of a bar 63 with a bracket 64 which isfixedly mounted to table II. It will be readily appreciated from theforegoing disclosure and the illustration in the drawings that when thetable I I is reciprocated longitudinally relative to the base I0, theslide 62 is moved simultaneously by means of the bracket 64 and the rod63.

In orderthat the uid pressure system maybe so controlled as to produce apredetermined crown or curvature on the roll being ground, a suitable,positively actuated, mechanically controlled or retreating stopmechanism is provided which in the preferred form comprises a rotatablescrew 65 which is journaled in bearings 66 and 61 in the bracket 64. Apartial nut 68 meshes with the screw 65 and is pivotally connected bymeans of a pin 69 to bracket 39 which projects from the end of theswivel table I4. It will be readily appreciated from this disclosure andthe illustration in Figs. 5 and 7 of the drawings that rotation of thescrew 65 relative to the nut 68 serves to definitely control and limitthe swiveling movement of the table I6 relative to the table II. f

In order that the swiveling movement may be definitely controlled by andin timed relationship with the longitudinal reciprocation of the Workcarrying member, a suitable connection is provided between the formingbar andthe screw. The longitudinal. movement of. the slide A62 relative`to bar 60- is transmitted to cause a predetermined rotary motionv tothe screw 65 so as to cooperate with the nut 68 and permit apredetermined swiveling, movementv of the table I4 relative to the tableII by means of the fluid pressure piston 36. In order to control therotary motion of the screw G5. to produce the desired crownv on the.surface of thev roll, a rack bar 15 is slidably mounted within bracket64 and is connected at its. lower end with the slide 6.2. The rack bar1.5 meshes with a. gear 1.6 mounted on the outer end of the screw shaft55. It will be readily appreciated. from the foregoing disclosureV andthe illustration in the drawings that when the .table II isreciprocated. relative to the base, the slide 6,2. will be carriedthrough a corresponding distance along the forming bar 60. This bar 69is set parallel to the table movement; then no movement will betransmitted to allow or permita swiveling movement of the table I4. If,however, the forming bar is adjusted angularly relative to the path ofmovement of the table II, a movement of the slide 62 along the bar 60will transmit a vertical motion to the rack bar 15 relative to thebracket 64 which is. iixed to the end of the table II, so as to transmita rotary motion to gear 16 and screw 65 so as to permit a.predetermined, positively controlled swiveling movement of the table I4relative to table Il.

In order to prevent any backlash between the rack 1:5. and gear 16, acompensating mechanism is provided comprising a narrow, slidably mountedrack bar 11 whichis slidably mounted in the face of the rack 15. Thisadjustable rack 11 may be adjusted relative to the rack 15 by means ofa. screw 19 fixed in the end of the rack'bar 15 and nuts 8|!v and 8l. Byadjusting the. nuts 86 and BI relative to screw 19, any backlash betweenthe rack and the gear may be eliminated. I

The foregoing describes a single control unit at the left-hand end ofthe machine, as viewed in Figs. 1 and 2. In the preferred construction,an identical control unit is provided at ythe righthand end of themachine, as illustrated in Figs.

l and 2. This unit comprises a forming bar 85 pivotally mounted on thestud 86 and carrying a slide 81 thereon. The slide 81 is carriedlongitudinally by a bar 88 which is connected tothe slide and isslidably mounted in a bracket 89 projecting from the right-hand end oftable II. A rack bar 90, also carried by slide 81, is slidably mountedin bracket 89 and meshes with a gear 9I mounted on lthe end of a screw92 which meshes with a. nut (not shown )on a bracket 93.

In the preferred adjustment of parts, the

forming bars 6 andv 85 are adjusted to the samev angular position, sothat when the table moves toward the right, as Viewed in Figs. l and 2,the forming bars, slides and screws 65 and 92 together with theirconnecting parts serve to control the swiveling movement of table I6relative to table II in a counterclockwise direction; and similarly,when the table is reversed in its direction of movement so that it movestoward the left, as viewed in Figs. 1 and 2, serve to transmit a rotarymotion to screws 65 and 92 so 'as to control the movement of the swiveltable I6 in a counterclockwise direction relativeto table II to producethe desired predetermined crown on the periphery of the roll 20 beingground.

Pressure lcontrol device In a massive roll grinding machine of the typeillustrated in the drawings and to which this invention applies, thetables, headstock and footstock are massive, heavy parts. The headstockis several times heavier than the footstock, thereby causing adifferential in friiction between the swivel and longitudinally movabletables at their opposite ends. If equal pressures were applied to thecylinders at opposite ends of the table, this would result in possibleflexing of the table from its normal path of movement, due to the factthat the frictional forces are greater at the headstock end than at thefootstock end.

To attain one of the objects of this invention, namely, to provide adifferential in the iluid pressure system which enables separateadjustment and regulation of the fluid pressure being applied to eachcylinder at opposite ends of the table, a suitable pressure controlvalve is provided which permits applying a higher pressure to thecylinder 3'! than that applied to cylinder 40, so that the differentialin friction between the swivel and longitudinally movable tables may beequalized. In the preferred form, this mechanism (Fig. 8) comprises amodified piping and fluid pressure system including a pump which isconnected by pipe |0| with a pressure control valve |02. The pressurecontrol valve is connected to a reverse valve |03 which is in turnconnected to cylinders 3'] and 40. Fluid from the pipe |0| enters thepressure control valve chamber |04 and passes through pipe |05 intoreverse valve chamber |06 which, in the position illustrated in Fig. 8,passes fluid through pipe |01 into cylinder chamber 50. The valve member|08 is yieldably held in a closed position by a spring |09, the tensionof which may be adjusted by screw ||0. The screw ||0 may be locked inadjusted position by lock nut 1H. By manipulation of the adjusting screwl0, the tension of the spring |09 may be varied, so that the desiredpressure will be maintained in pipe line |05, but so that if the pumppressure is greater than that required in line |05, the pressure isrelieved by partially opening the valve |08. When valve |08 is opened,uid under pressure passes through a passage ||2 into chamber ||3 througha pipe H4, valve chamber H5, pipe ||6, into cylinder chamber 5|. In theposition of the valve illustrated in Fig. 8, the pistons 36 and 4| applya force to the swivel table |4 tending to move the swivel table in acounterclockwise direction. A valve'member is backed by a spring ||8,the tension of which may be adjusted by a screw ||9 and lock nut |20, sothat the pressure in the pipe line ||4 may be varied as desired. If thepressure within the chamber ||3 is greater than that required in thepipe line H4, the excess pressure will cause the valve ||'|to open andthe fluid to exhaust through pipe |2| into the reservoir.

It will thus be seen that by utilizing a modified construction, such asthat shown in Fig. 8, the pressure applied at opposite ends of theswivel table to cause the desired swiveling motion may be varied toovercome the differential of friction between the swivel table and thelongitudinally movable table.

Conccwe crown In certain types of grinding, it is necessary to produce aconcave crown on the periphery of the roll. When the bars 60 and 85 areadjusted into position 60a and 85a, as indicated in Fig. 1, thisadjustment operates through screws 65 and 92 to shift the position ofthe swivel table 4 so that at the start of the grinding operation, theend of the roll is farther away from the wheel axis and as the roll istraversed or reciprocated, the screws serve to swivel the table so as toproduce a hollow or convex surface on the periphery of the roll. Inorder to assist in this reverse movement of the table, it is necessaryand desirable that the fluid pressure system be reversedautomaticallywithout attention on the part of the operator, so that when the bars arein a position to concave the roll, the fluid pressure system serves toapply a swiveling movement to the table I4 so as to produce the desiredconcave surface on the periphery of the roll. To accomplish this resultautomatically, a reversing switch |30 is mounted on the base of themachine. This .switch carries a reversing arm |3| having a roller |32engaging a cam |33 which is adjustably fixed to the forming bar 60. Thisconstruction is diagrammatically indicated in Fig. 2 and shows the barin the full line position, as indicated in Fig. 2, the roller |32 is onthe low point of the cam |33. When the bar 60 is shifted into position60a, the bar 60, as illustrated in Fig. 2, moves upwardly, carrying thecam 33 upwardly, which serves to rock the roller |3| and arm |32 of thereversing switch |30 so as to shift the movable switch member into thereverse direction, so as to reverse the operation of the fluid pressuresystem to enable the grinding of a concave surface on the roll beingground.

In setting up the forming attachment for grinding a given roll, it isdesirable to apply a predetermined pressure at opposite ends of thetable so as to bow or flex the table to take out the spring in theswivel table parts, so that during the operation of the machine, theswivel table is always under a flexing tension. In order to initiallyflex the tabie to a desired and predetermined extent, each of the rackbars 'i5 and 90 is adjustably connested to the slides 62 and 8lrespectively. The lower end of each rod has a reduced threaded portion|36 which passes through an aperture in the slides 62 and 3lrespectively. Nuts |31 and |38 are provided to locate the rack bars l5and 90 respectively relative to the slides 62 and 81. By

adjusting the nuts |37 and |38 at each end of the table, the racks 'i5and 90 may be moved up or down, causing a rotation of the gears 16 andscrews 65 and 92, which serves to flex or bow the swivel table |4 toplace it under an initial strain to prevent any exing of the table dueto the movement transmitted thereto by the forming attachment or thethrust of the grinding wheel.

In the preferred form of this invention, the gears T6 and 9| areadjustably mounted on the screw shafts 65 and S2 and are held inadjusted position by lock nuts |35. This adjustment is identical on bothmechanisms at the ends of the table, and consequently only details ofthe lefthand mechanism have been illustrated in Fig. 7. It will bereadily appreciated from this construction that the operator may bystriking oi on the nuts, adjust the gears 76 and 9|, so that theyoperate in synchronism.

The operation of this machine will be readily apparent from theforegoing disclosure. The operator places a roll to be ground in themachine, rsupporting it on centers or in any wellknown manner common tothe roll grinding industry, such as journal rest supports; then adlllaoeacc justs the position of the forming bars- 60- and 85 so as toproduce a desired and predetermined convex or concave crown on the rollto be ground. The table reciprocation is started and as the table I Ireciprocates relative to the base l0, the swivel table I6 is rockedabout the pivot Il as an axis to vary the center distance between theaxis of the Work and the axis of the grinding wheel duri-ngrreciprocation, so that either a concave or a convex crown'may beproduced on the roll, as desired.

Having thus described the invention, what we claim as new and desire tosecure by Letters Patent is:

l. A roll grinding machine having a rotatable grinding wheel and arotatable work support which are movable transversely and longitudinallyrelative to each other, means to move one of said members relativelytoward and from the other to produce the desired feeding movement togrind a roll to a predetermined size, an additional mechanismoperatively connected to cause an independent relative transversemovement between the wheel and work support as they are reciprocatedlongitudinally relative to each other to grind'a crown onl the rollbeing ground, and a positively actuated control device independent ofsaid mechanism which is actuated during the relative longitudinalmovement between the grinding wheel and work to positivelycontrol saidindependent relative transverse movement between the wheel and the worksupport as caused by said mechanism so as to produce a predeterminedcrown on the roll being ground.

2. A roll grinding machine having a rotatable grindingwheel and arotatable work support which are movable transversely and longitudinallyrelative to each other, means to move one of said members relativelytoward and from the other to produce the desired feeding movement togrind a roll toa predetermined size, a fluid pressure mechanismoperatively connected to cause an independent relative transversemovement between the wheel and work support as they are reciprocatedlongitudinally relative to each other to grind a crown on the'roll beingground,`and a control device including a positively moved stop which isactuated during the relative longitudinal movement between the grindingwheell and work to positively control the independent relativetransverse movement of said members as caused by saidiluid pressuremechanism so as to regulate and control lthe relative movelnent betweenthe wheel and work support to produce a predetermined crown on the rollbeing ground.

3. A roll grinding machine having a rotatable grinding wheel and arotatable work support which are movable transversely and longitudinallyrelative to each other, means to move one of said members relativelytoward and from the other to grind a roll to a predetermined size, anadditional mechanism operatively connected to cause a relativetransverse movement between the wheel and work support as they arereciprocated longitudinally relative to each other, and a control deviceincluding an adjustable bar and follower and a Vstop positively movedthereby which serve to regulate and control therelative transversemovement between thewheel and work support so as to produce apredetermined crown on the roll being ground.

4. A grinding machine comprising a base, a transversely movable slidethereon, arotatable grinding wheel supported on said slide, alongitudinally movable-table on said base, aswivel table' pivotallymounted on said first table, a rotatable work support on said swiveltable, fluid pressure means interposed between said tables to cause theswivel table to swing relative to the longitudinally movable table as itreciprocates, and a positively actuated control device independent ofthe hydraulic mechanism which regulates and controls1 said fluidpressure operated swiveling movement of the swivel table as thelongitudinally movable table reciprocates and so produces the desiredform on the roll being ground.

5. A roll grinding machine having a rotatable grinding wheel and arotatable work support which are rmovable transversely andlongitudinally relative to each other, means to move one of said membersrelatively toward and from the other vto produce the desired feedingmovement to grind a roll to a predetermined size, a fluid pressuresystem including a piston and cylinder which are operatively connectedto cause a relative transverse movement between the wheel and worksupport as they are reciprocated longitudinally relative to each other,and means including an adjustable bar and follower and a control deviceactuated by the follower and independent of the fluid pressure mechanismwhich serves to regulate and control the relative movement between saidmembers caused by said lluid pressure piston and'cylinder so as toregulate and control the relative movement between the wheel and worksupport to produce a predetermined crown on the roll being ground.

6. A grinding machine comprising a base, a transversely movable slidethereon, a rotatable grinding wheel` supported on said slide, alongitudinallymovable table `on said base, a swivel table pivotallymounted on said iirst table, Aa rotatable'work support on said swiveltable, a fluid pressure system including a piston and cylinderinterposed between said tables to cause the swivel table to swingrelative to the longitudinally movable table as it reciprocates, aforming bar adjustably xed on the base, and an independently actuatedcontrol mechanism and connections between said device and the bar, thelongitudinally movable table and the'swivel tabley to positively controlthe extent of swiveling of said swivel table as the table reciprocatesto lproduce the desired form on the roll being ground. 7. A grindingmachine comprising a base, a transversely movable slide thereon, arotatable grinding wheel supported on said slide, a longitudinallymovable table on said base, a swivel table pivotally mounted 'on saidrst table, a rotatable work support on said swivel table, a fluidpressure system including va piston and cylinderinterposed between saidtables to cause the swivel table to swing relative to thelongitudinallly movable table as it reciprocates, a forming barad-justably lixedV on the base, means including a nut and screwmechanism interposed between the longitudinally movable and swiveltables, and connections between said bar and screw to rotateV saidscrewV as the table is reciprocated. to positively control the extent ofswiveling of said swivel table as the table reciprocates to-produce thedesired form on the roll being ground,

8. In a roll grinding machine having a transversely movable wheel'slide,a longitudinally movable work table,a work supporting member pivotallymounted on said table and arrangedl yto rotatably support a roll inoperative relation with the grindingwheel, and a 'forming apparatusincluding a barv adjustably positioned on the base, aisne@ carried bysaid bar as the tame vmoves longitudinally, a uid pressure systemincluding a piston and cylinder operatively connected between the endsof the longitudinally movable table and the swivel table, and meansincluding a nut and screw interposed between said longitudinally movabletable and swivel table which are actuated by said. slide as the table isreciprocated to positively control the swiveling movement of said tableto produce the desired crown or form on the periphery of the roll beingground.

9. A forming attachment for roll grinding machines comprising atransversely movable wheel slide, a rotatable grinding wheel thereon, alongitudinally movable table, a swivel table pivotally mounted on saidmovable table, a rotatable work support on said swivel table, a uidpressure system including a piston and cylinder interposed between thelongitudinal and swivel tables which are arranged to cause a swinging ofthe swivel table as the longitudinal table is reciprocated, a fluidpressure pump arranged to convey fluid under pressure to either end ofsaid cylinder, a control valve arranged to control the fluid pressureadmitted to said cylinders, and a control device arranged to positivelycontrol and regulate the swiveling of said table so as to produce apredetermined crown on the roll being ground.

10. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel thereon, a longitudinally movabletable, a swivel table pivotally mounted on said movable table, arotatable work support on said swivel table which is arranged torotatably support a roll in operative relation with the grinding wheel,a uid pressure system including a piston and cylinder at each end ofsaid table which are operatively connected between the ends of thelongitudinally movable table and the swivel table to cause a relativeswiveling of the work support as the table is reciprocated, a fluidpressure pump arranged to force fluid to opposite ends of said cylindersrespectively to cause the work support to swivel in one direction, areversing valve arranged to reverse the flow of uid in said system tocause the swivel table to swivel in the opposite direction, and meansactuated in timed relation with the table movement to reverse said valveat each end of the table stroke.

11. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel thereon, a longitudinally movabletable, a rotatable work support supported on said table which isarranged to rotatably support a roll in operative relation with thegrinding wheel, a feeding mechanism to move said grinding wheel and workrelatively toward and from each other to grind the roll to apredetermined size, a uid pressure system including a piston andcylinder at each end of said table which are operatively connectedbetween the ends of said longitudinally movable table and said worksupport to cause a relative transverse movement therebetween as thetable is reciprocated, and a fluid pressure control device which permitsvarying the fluid pressure conveyed to cylinders at opposite ends of thetable.

12. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel thereon, a longitudinally movabletable, a rotatable work support supported on said table which isarranged to rotatably support a roll in operative relation with thegrinding wheel, a feeding mechanism to move said grinding wheel and workrelatively toward and from each other to grind the roll to apredetermined size, a fluid pressure system including a piston andcylinder at each end of said table which are operatively connectedbetween the ends of said longitudinally movable table and said worksupport to cause a relative transverse movement therebetween as thetable is reciprocated, means including a forming bar arranged topositively control the relative transverse movement between the wheeland work, and a fluid pressure control device which permits varying thefluid pressure conveyed to cylinders at lopposite ends of the table.

13. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel thereon, a longitudinally movable worktable, a swivel table pivotally mounted on said table and arranged torotatably support a roll in operative relation with the grinding wheel,means to feed said slide toward and 'from the work support to grind aroll to a predetermined size, a iluid pressure system including a pistonand cylinder operatively connected between the swivel and longitudinallymovable tables, a pump to convey fluid to opposite ends of saidcylinder, and a reversing valve operatively connected to change thedirection of flow of iiuid in said system when the longitudinallymovable table is reversed in its direction of movement.

14. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel thereon, a longitudinally movabletable, a swivel table pivotally mounted thereon, a rotatable worksupport on the swivel table, a feeding mechanism to cause a relativetransverse movement-between the grinding wheel and 'the work, means toreciprocate said table, and a forming apparatus including a fluidpressure system to swivel said table as it reciprocates including apiston and cylinder interposed between the swivel and longitudinallymovable tables, and a control mechanism to positively control the fluidpressure swiveling of said table including a nut and screw mechanisminterposed between the longitudinally movable and the swivel table, aforming bar adjustably mounted on the base, a slide slidably mounted onsaid bar, and connections between the slide and the screw to rotate thescrew as the table reciprocates to control the swiveling movement so asto produce a predetermined crown on the roll being ground.

15. A roll grinding machine comprising a transversely movable wheelslide, a rotatable grinding wheel, a longitudinally movable work table,a swivel table pivotally mounted thereon, a rotatable work supportincluding a headstock 'and a footstock on said swivel table, a feedingmechanism to cause a transverse movement of the grinding wheel relativeto the work, a reciprocating mechanism to reciprocate said table, and aforming apparatus including a fluid pressure system comprising a pistonand cylinder at each end of the table interposed between thelongitudinally movable table and the swivel table, a pump for conveyingfluid under pressure to said cylinders, a reversing valve actuated intimed relation with the table reciprocating mechanism to change thedirection of flow of fluid in said system, a pressure control valve insaid system which is arranged to permit independently varying the fluidpressure for each cylinder, and a control device to positively controlthe swiveling movement of said table as caused by said fluid pressuremechanism including a nut and screw interposed between the swivel andlongitudinally movable tables, an adjustable forming bar on the 75 base,a slide slidably mounted on said bar, and connections between said slideand screw to rotate said screw as the table reciprocates.

16. A roll grinding machine comprising a transversely movable wheelslide, a longitudinally movable work table, a swivel table p-ivotallymounted on said table, a massive headstock on one end of said swiveltable, and a footstock on the other end of said swivel table torotatably support a roll to be ground in operative relation with thegrinding wheel, means to cause a transverse feeding movement of thegrinding wheel slide toward and from the work support to grind the workto a predetermined size, means to reciprocate said work supportlongitudinally relative to the grinding wheel, a fluid pressure systemincluding a piston and cylinder at each end of said table which areinterposed between the swivel and longitudinally movable tables to causea swiveling of the swivel table as the longitudinally movable table isreciprocated, a. i'iuid pressure pump arranged to convey iiuid toopposite ends of the respective cylinders to cause a swive-ling movementin one direction when the table is traversed in one direction, areversing valve to reverse the direction of uid and cause the swiveltable to be swiveled in the opposite direction when the table movementis reversed, means actuated in timed relation with the tablereciprocation to reverse the direction of uid movement when the table isreversed, and a pressure control valve which is so arranged as to permitvarying the iiuid pressure applied to the cylinders at opposite ends oisaid table so as to overcome the diierence in friction between oppositeends of the table and the swivel table caused by the varying weights ofthe head and foot stock mounted thereon.

